Im not sure where you can see leafeon in the game, but Im sure you probably see it on another trainer. To get leafeon, get an eevee by talking to the guy in the mansion under hearthome city. He will tell you if he saw an eevee or not, catch it there. Then, when you do, train the eevee at any time of day or night, next to the mossy rock in eterna forest. Train it until 1 level HIGHER. Then, it will evolve into LEAFEON. Hope this helped :)
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two trainers on the way to Pokemon mansion from pastoria have them.
to get a leafeon in Pokemon platinum, you need to have an eevee and then at any lvl you have to use a leaf stone!
You have to get it from a friend who has Pearl/Diamond/Platinum
Get an alkazam or gyarados
To get both leafeon and glaceon in Pokemon soul silver or heart gold you have to trade it from diamond pearl or platinum.